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Contents

Stella says "yes" to Ted's proposal. Robin takes a new job in Japan, but quickly resigns, returning to New York to attend Ted's wedding. Stella leaves Ted at the altar to get back together with the father of her daughter, Tony. Barney struggles with his feelings for Robin as his company shifts him to the management team of a new acquisition, Goliath National Bank (GNB).

Marshall and Lily move to their new apartment and debate over whether or not they're ready to have children. Robin becomes roommates with Ted and gets a job as an anchor for a 4:00 A.M. news show after Barney sends out her video resume. Ted finds out about Barney's feelings for Robin when Ted and Robin sleep together constantly so they won't fight over each others bad co-living habits.

Ted is asked to design the new GNB headquarters but he is fired after the plans for the new building is scrapped. Because of this, Ted loses his job and then starts his own company, Mosbius Designs.

Ted finds out Lily has sabotaged all of his relationships with anyone she doesn't approve of and indirectly may have inspired his breakup with Robin. Robin and Ted end up talking about it, causing their friendship to begin moving towards a positive note. As Barney finally sleeps with his 200th woman, after rubbing it in the face of the childhood bully that taunted him into pursuing it, he questions what the rest of his life would be about now, leaving him more certain of his feelings for Robin.

Ted, while carrying the yellow umbrella, bumps into Stella and Tony. Tony later decides to visit him, sympathizing with Ted over his loss of Stella. Tony offers him a job as a professor of architecture, which Ted initially turns down. Lily abandons the group and disappears for four weeks after hearing a dirty joke from Barney.

In the season finale, Robin finds out about Barney's love for her, which she cautiously reciprocates. Ted decides he is done being an architect and finally decides to instead teach architecture classes. The finale ends with Ted stating that the mother was in the first class he went into.

Both Alyson Hannigan and Cobie Smulders were pregnant during the fourth season, so their character's are seen wearing loose clothing, and holding large objects to cover their stomachs.

Alyson Hannigan's pregnancy was referenced throughout most of the season.

During the episode The Possimpible, Lily is shown competing in two hot dog eating contest (one in a flashback and one in the present) where she has a visibly enlarged stomach.

When Marshall attempts to jump across the roof to the neighboring apartment building in The Leap, Lily tries to stop him by claiming she's pregnant. She then feels insulted when Marshall says that he noticed that she's been gaining weight recently.

Lily's disappearance from the group after hearing Barney's dirty joke was actually her maternity leave.

Tired of having to constantly travel back and forth between New Jersey and New York to spend time with Stella and the gang, Ted convinces the gang to go to New Jersey. Meanwhile, Robin's career is in jeopardy.

Ted, Marshall and Lily all prepare to move out of their apartment, and Robin prepares to leave to Japan. In doing so, they reminisce about their past, including interventions that they held for one another.

Ted walks in on Robin's date, Mitch, attempting to perform a technique he's dubbed "The Naked Man", to pick up girls. When the gang find out that it worked on Robin, Lily, Barney and Ted all attempt it.

Ted's sister, Heather, is moving to New York and Ted tries to keep her away from Barney. Meanwhile, Marshall takes Robin to the bar he goes to when he’s feeling down, but she fits in a bit too well with the Minnesotan-theme.

Three stories unfold during a snowstorm in NYC: Ted and Barney take over MacLaren's, Marshall and Robin talk about romantic rituals while picking up Lily from the airport while she races to buy Marshall a souvenir of her trip.

Karen breaks up with Ted. He discovers that Lily was responsible and has been meddling with his relationships for years. The gang stays up late to watch Robin's morning show and Barney is seduced by Marshall's nightgown.

Ted’s project to design a new building for Goliath National Bank gets scrapped but Barney and Marshall pretend it wasn’t to spare his feelings. Robin admits she once went home with a celebrity who made an unusual sex request.

Ted tries to start his own architecture firm but Robin keeps sleeping with his new assistant—much to Barney's dismay. Marshall tries to ensure job security and Barney turns to him for advice after offending Lily.

Ted recounts the series of events that led to him being in the right place at the right time for a life-changing encounter. Barney prepares for his 200th conquest and Marshall abuses the Graphics Department at GNB.

Ted has an awkward run in with Stella and Tony, prompting Tony to apologize for "stealing" Stella by offering Ted a job. Meanwhile, Robin and Marshall recount times they talked their ways out of speeding tickets, after Barney fails to do so.